1 files changed, 2 insertions, 0 deletions
diff --git a/libio/iovsscanf.c b/libio/iovsscanf.c
index 5b4c790517..6e7d8c59e2 100644
--- a/libio/iovsscanf.c
+++ b/libio/iovsscanf.c
@@ -30,8 +30,10 @@ DEFUN(_IO_vsscanf, (string, format, args),
       const char *string AND const char *format AND _IO_va_list args)
 {
   _IO_strfile sf;
+#ifdef _IO_MTSAFE_IO
   _IO_lock_t lock;
   sf._f._lock = &lock;
+#endif
   _IO_init((_IO_FILE*)&sf, 0);
   _IO_JUMPS((_IO_FILE*)&sf) = &_IO_str_jumps;
   _IO_str_init_static ((_IO_FILE*)&sf, (char*)string, 0, NULL);